LM79 NSC [National Semiconductor], LM79 Datasheet - Page 9

• Manufacturer Part Number: LM79
• Description: Microprocessor System Hardware Monitor
• Manufacturer: NSC [National Semiconductor]

SERIAL BUS TIMING CHARACTERISTICS
t
t
t
t
t
1
2
3
4
5
AC Electrical Characteristics
+5.75 V
25˚C. (Continued)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: All voltages are measured with respect to GND, unless otherwise specified
Note 3: When the input voltage (V
The 20 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5 mA to four.
Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
allowable power dissipation at any temperature is P
Note 5: The human body model is a 100 pF capacitor discharged through a 1.5 k
directly into each pin.
Note 6: See the section titled “Surface Mount” found in any post 1986 National Semiconductor Linear Data Book for other methods of soldering surface mount
devices.
Note 7: Each input and output is protected by a nominal 6.5V breakdown voltage zener diode to GND; as shown below, input voltage magnitude up to 0.3V above
V
can occur if these diodes are forward biased by more than 50 mV. As an example, if V
conversions.
CC
Symbol
or 0.3V below GND will not damage the LM79. There are parasitic diodes that exist between the inputs and the power supply rails. Errors in the ADC conversion
DC
unless otherwise specified. Boldface limits apply for T
SCL (Clock) Period
Data In Setup Time to SCL High
Data Out Stable After SCL Low
SDA Low Setup Time to SCL Low (start)
SDA High Hold Time After SCL High (stop)
IN
) at any pin exceeds the power supplies (V
Parameter
D
= (T
FIGURE 3. Serial Bus Timing Diagram
J
max−T
(Note 13) The following specifications apply for +4.25 V
A
)/
JA
.
IN
<
9
(GNDD or GNDA) or V
A
resistor into each pin. The machine model is a 200 pF capacitor discharged
= T
Conditions
CC
J
is 4.50 V
= T
MIN
DC
J
to T
max,
IN
, input voltage must be
>
DS100036-6
V
MAX
CC
JA
(Note 8)
Typical
), the current at that pin should be limited to 5 mA.
and the ambient temperature, T
; all other limits T
(Note 9)
4.55 V
Limits
100
100
100
DC
2.5
0
A
DC
= T
, to ensure accurate
V
CC
J
A
=
. The maximum
www.national.com
(Limits)
µs (min)
ns (min)
ns (min)
ns (min)
ns (min)
Units